Valve



Dec. 13, 1927.

C. W. MURRAY, JR

VALVE Filed July 23. 1927 w \&\\ m \1 d v z 1\\ `V\\ k K da AQ8 \X I d3k I a3 J a 1 a! 4T z a4' 9 a! a 1 z a. b b2 y b2 a.; l

Patented Dec. 13, 1927.

UNITEB f STATE-ls CHARLES TN. MIIBRAY, JR., .OFXCINGINNATL y01H10.

, VALVE.

Application filed July Y23,

f'My invention relates to valves and`more` particularly tothe operatingmechanismfor Y actuating and reseating such valves. y

My valve is designed primarily yfor useiin an internal combustion engineand is best adapted for that purpose, however, it may be used whereverthe seat of a lpoppet vaive is liable to fouling or corrosion and`therefore will fail to kSeat tightly. p

"The principal object of my `invention is to provide .a Yvalve embracingthe 'advantageous features of both the p'oppet and sleeve valves andeliminating the incidental disadvantages of both. l

This result is attained by providing means for rotating the valve whileseated, thus grinding the valve and seat and keeping the coactingsurfaces of both smooth and polished at al'l times. This insures aleaktight fit and prevents fouling, grooving and pitting, resulting inleaking. Leaking causes loss of compression in an internal combustionengine.

Another object of my invention is to prevent warping of the valve stemby constantly changing its angular position during operation. `Therotation also prevents sticking.

'Va'lves now in use in `automobile engines require grinding about every5000 miles when ordinary gasolene is used. With my invention the valvescontinue effective almost indefinitely and need no grinding. No carbonor other foreign matter is allowed'to pack on the valve seat due to thegrinding effect of the rotation and, as a result, a Very cheap grade ofgasolene. can be used effectively.

i While it is generally considered that a sleeve va'lve is superior to apoppet valve for automotive use, yet sleeve valves are much moreexpensive to manufacture, require more battery power in the automobileand greatly increase oil consumption. My invention makes the poppetvalve as effective as a sleeve valve and eliminates these objectionablefeatures.

In the particular embodiment of my invention selected for .illustrationFig. l is a rear elevation ofthe valve and the actuating cam and itsshaft, the valve seat, lugs on the valve case of the engine and camsha-ft being shown in section withyparts unnecessary to this disclosurebroken away. The valve is shown seated,

1927. 'seriali-No. 207,884. p

Fig. '2 Yis a viewgisimilarto Fig. 1 but rwith the valve unseated, g

`lFig. 3, ta Cdetail,:isfa bottom plan Aviewof the ratchetwl'reelandFig. 4 is a .cross-section onthe line 4--4of llignl..VV

' JReferring nowtoithe drawings the'valve A has'fa Vstem a. 'Ihe'valve Aiis adapted yto coact with a Vseat m1 fformed in 'the valve casing 2M.Aratchet .Wheel al having ratchet teeth 'd'2 and "hub a3 `is securedttothe stema suitable manner. The stem a passes thru holes m2 and m4 thruthe lugs m and m3 respectively of the valve case of the engine which actas guides. On the valve stem a is a coiled spring L7 with a cup-washera8 at the top seated against the lug m, and a v similar washer a5 at thebottom, secured against downward movement by the pin a6. The lower enda9 of the stem a projects a short distance below the ratchet teeth a2 sothat the actuating cam, hereinafter described, will bear against a9 andprevent its point contacting with the teeth. Suitable bearings (notshown) may be placed between theV shoulder m and valve stem, anda ballbear-- ing collar or other friction reducing device (not shown) may beyinserted between the top of the Washer a5 and spring a7. I

An operating cam Bis rotatablysecure'd to the cam shaft b. Opposite thepoint 'b1 and at one side of the peripheral face of the cam B is a toothor pawl b2 adapted to engage the ratchet teeth a2.

It can be seen in Fig. l, that while the valve is seated the point b1 ofthe cam B is away from the end a9 of the valve stem a and the tooth orpawl b2 is rotating the valve while seated. In Fig. 2 the valve is shownv open and the tooth b2 out of contact withA the teeth a2 of the ratchetwheel and the point b1 is raising the valve stem a.

While I haveshown a single pawl on the cam B a plurality of such teethmay be used instead.

I do not wish to be limit-ed to the precise sov form of device shown butclaim as within v the scope of my invention all devices readable on theclaims. I claim as my invention and desire to secure by Letters Patentof the United States: l. vIn combination, a valve and a stem for saidvalve, a ratchetwheel secured to said eoaet with said seat, a steinfixed to said valve, a spring eonstantl tending to keep said valveclosed, a rate 1ct Wheel fixed to said stein, a eain having a pointadapted to open said valve, a pawl on said ealn opposite said point andadapted to` coaet with the teeth of said ratchet Wheel and means forrotating said cam. v p v p 3. Valve mechanism comprising a valve seat, avalve adapted to coaet With said seat, a stem fixed to said valve, apair of cup- Washers onsaid stein and a spring compressed betWeen saidwashers constantly tending to keepsad valveseated, a ratchet wheelsecured to said stem, a cam shaft and a cam on said shaft, a point onsaid cam to unseat. said valve, a pawl on said caln opp0` site saidpoint and adapted to eoaet with the teeth of said ratchet to rotate saidvalve when seated. l

Ll. Valve mechanism comprising a valve seat, a valve adapted to eoactwith said seat, a stem lixed to said valve, a pair of eupwashers onsaidstein and a spring compressed between said Washers constantlytending tc keep said valve seated, a ratchet Wheel secured to saidstein, a cam shaft and a cani on said shaft, a point on said ealn tounseat said valve, a pawl at one side of the periphery of said camopposite said point and adapted to coaet with the teeth of said ratchetwheel to rotate said valve when seated. v A

In testimony wheleotI have hereunto 'set my hand.

CHARLESV. MURRAY, Jail

